Cloud is going be far easier to transition for most companies compared to Office, Browsers, OS and Hardware. There are basically no non-american competitors, and so many companies deeply relying on the tech don't have the IT capacity to implement something OSS like Linux.
Yes, but if the government were to spend say 10% of their GPD on defense and infrastructure (Hi, German!), some of this spending might be in grants/tax breaks to help companies make this transition.
I think you underestimate what a capitalist system can accomplish, and how quickly.
